Sheet metal roofing



June 27, 1939; M. L. HUNKER 2,163,840

SHEET METAL ROOFING F'iled'June s, 1938 JL an'l'n LIEU/liter Patented June 27, 1939 SHEET METAL noormo Martin L. Hunker, Dover, Ohio, assignor to Reeves Steel and Manufacturing Company, Dover, Ohio, a corporation of Ohio Application June 3, 1938, Serial No. 211,631

2 Claims.

The invention relates to sheet metal roofing and more particularly to lap joints for roofing sheets.

Because of its simplicity of construction and low cost of manufacture the V type of sheet metal roofing has been widely used in the past. Such roofing sheets are provided at their side edges with inverted, V-shape channels adapted to overlap to form lap joints between adjacent sheets.

There are certain objections, however, to this type of roofing. In order to prevent the V-shape channels from collapsing when nails are driven through the joints it is customary to nail triangular strips of wood upon the supporting timber member of the roof at the points where the lap joints occur.

Another objection is that moisture, by capillary attraction sometimes creeps through the joint, between the lapped V portion of the sheets, and causes leakage.

The object of the present invention is to overcome these objections by providing a V-type roof-- ing sheet which has sufilcient strength to permit nails to be driven through the lapped joints without collapsing of the V joints, and which is so constructed that moisture cannot pass through the joint.

Another object is to provide a roofing sheet of this character in which two spaced drain troughs are provided within each lap joint for draining out any moisture that may pass into the joint, thus overcoming the possibility of the passage of water by capillary attraction to the interior of the roofing and at the same time providing for free circulation of air through the joint whereby any moisture collecting therein is quickly dissipated.

The above objects together with others which will be apparent from the drawing and following description or which may be later referred to may be attained by constructing the improved roofing sheet in the manner illustrated in the accompanying drawing in which:

Figure 1 is a perspective view of a portion of a roofing sheet constructed in accordance with the invention; and

Fig. 2, an enlarged transverse sectional View through the lapped joint of two adjacent sheets.

Similar numerals refer to similar parts throughout the drawing.

The improved roofing sheet to which the invention pertains is indicated generally at I0, and is provided along its side edges with the substantially inverted V formations indicated generally at II and I2, the V formation II of each sheet being adapted to be lapped over the V formation l2 of the next adjacent sheet. If desired, for the purpose of added strength, as well as carrying out the design, an inverted V formation I3 may be formed through the central portion of each sheet.

A supporting timber I4 such as sheathing is provided as in usual practice, the roofing sheets forming the invention being mounted thereon as indicated in Fig. 2.

The V formation II at the overlapping edge 10 portion of the sheet comprises the oppositely inclined legs I5 and I6, each of which is located at substantially the same angle to the normal plane of the sheet, the terminal leg I6 being preferably of less length than the leg I5, and being provided with the outwardly disposed longitudinal channel I1.

The opposite or lapped edge portion of the sheet is provided with the inverted V formation l2 comprising the angular leg l8 located at substantially the same angle to the normal plane of the sheet as the legs I5 and I6 of the V formation H, and with the terminal leg I9 located at an angle substantially half way between the leg I9 and the perpendicular end terminating in the upwardly and outwardly disposed angular flange 20 arranged to be disposed in abutting relation to the leg I5 of the overlapping formation.

When the overlapping V formation II of one sheet is lapped over the lapped V formation I2 of the next adjacent sheet, as shown in Fig. 2, it will be seen that drainage troughs and air chambers are formed at 2| and 22 by the channel I! and the terminal flange 20 respectively.

The channel I! of the overlapping V formation and the terminal leg I9 and angular flange 20 of the overlapped formation sufiiciently stiffen and. strengthen the joint'so that a nail as indicated at 23 may be driven through the legs l6 and I8 of the two V formations and into the supporting timber I4 substantially parallel to the terminal leg I9 so as to attach the roofing sheets to the supporting timber without danger of collapsing the lapped joint of adjacent roofing sheets.

The inclined leg I9 with terminal flange 20 and the channel I! form a rigid and stable struc- Well as draining any moisture which may pass into the joint from the left side thereof as viewed in Fig. 2 between the inclined legs l6 and I8, while any of the moisture which might possibly pass by capillary attraction over the apex of the V formation l2 will be drained into thetrough 22, the air chambers providing for circulation of air through the joint for quickly dissipating any moisture which may collect in the troughs.

I claim:

1. A lapped joint for roofing sheets comprising a lapped member having a V formation at its edge comprising two diverging legs, the terminal leg of the V formation being located at a less angle to the vertical than the other leg and terminating in an upwardly and outwardly disposed angular flange, said other leg of the lapped memher being straight from top to bottom, and an overlapping member formed at the edge of an adjacent sheet and comprising a V formation having two diverging legs each located at substantially the same angle to the vertical, the terminal leg of said overlapping V formation contacting the adjacent leg of the lapped member, an outwardly disposed, longitudinal channel in said last named terminal leg forming a drain trough and air channel, and said angular flange abutting the adjacent leg of the overlapping member forming a drain trough and air channel therebetween.

and comprising a V-formation having an inverted V-shaped crown for nesting in and supporting the crown of the lapped member, and two diverging legs each located at substantially the same angle to the vertical, the terminal leg of said overlapping 'V-formation contacting the adjacent leg of the lapped member, an outwardly disposed, longitudinal channel in said last named terminal leg forming a drain trough and air' channel, and said angular flange abutting the adjacent leg of the overlapping member forming a drain trough and air channel therebetween, and a nail located through the terminal leg of the overlapping member'above said outwardly disposed channel and through the adjacent leg of the lapped member and disposed substantially a parallel to the terminal leg of the lapped member.

MARTIN L. HUN'KER. 

